ICP Defrost Control Board for YG042GC9 — Heat Pump OEM 1069364 | Ships Today

Overview

This is a genuine OEM defrost control board (part number 1069364) for the ICP / Heil / Tempstar YG042GC9 heat pump. The defrost board is the brain of the outdoor unit in heating mode: it monitors coil temperature and run time, then commands a defrost cycle to melt frost off the outdoor coil, switches the reversing valve, and controls the condenser fan and 24V relays during that cycle. When this board fails, the heat pump may ice over, skip defrost, run defrost too often, or fail to switch between heating and cooling.

Specifications

Compatibility

Factory replacement defrost board for the ICP / Heil / Tempstar YG042GC9 heat pump. As an ICP family part, OEM 1069364 also fits the equivalent Comfortmaker, Heil, and Tempstar heat pumps that originally used this defrost control board. Verify the defrost timer pin settings (e.g., 30/60/90 min) match your old board.

Installation Guide

1. Safety First — Disconnect power at the disconnect and breaker. Verify zero voltage with a multimeter.
2. Access — Remove the condenser control-box access panel.
3. Document — Photograph every wire, the defrost sensor connection, and the timing jumper position before disconnecting.
4. Remove — Disconnect the harness, release the board standoffs/screws, and remove the old board.
5. Install — Mount the new board, set the defrost timing pin to match the original, and reconnect each connector per your photo.
6. Test — Restore power and confirm normal heating operation and a proper forced/initiated defrost cycle.

Signs You Need a Replacement

• Outdoor coil ices over and never defrosts
• Heat pump runs defrost constantly or at wrong intervals
• No switching between heat and cool, or fan won't respond during defrost
• Visible burn marks, corrosion, or cracked traces on the board

Shipping & Returns

Ships same day before 3 PM CST. 30-day returns. Backed by the National HVAC Parts fitment guarantee.